GS728TS, GS728TPS, GS752TS, and GS752TPS Gigabit Smart Switches
Class
You can classify incoming packets at layers 2, 3 and 4 by inspecting the following information
for a packet:
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Source/destination MAC address
•
EtherType
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Class of Service (802.1p priority) value (first/only VLAN tag)
•
VLAN ID range (first/only VLAN tag)
•
Secondary 802.1p priority value (second/inner VLAN tag)
•
Secondary VLAN ID range (second/inner VLAN tag)
•
IP Service Type octet (also known as: ToS bits, Precedence value, DSCP value)
•
Layer 4 protocol (TCP, UDP etc.)
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Layer 4 source/destination ports
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Source/destination IP address
From a DiffServ point of view, there are two types of classes:
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DiffServ traffic classes
•
DiffServ service levels/forwarding classes
DiffServ Traffic Classes
With DiffServ, you define which traffic classes to track on an ingress interface. You can define
simple BA classifiers (DSCP) and a wide variety of multi-field (MF) classifiers:
•
Layer 2; Layers 3, 4 (IP only)
•
Protocol-based
•
Address-based
You can combine these classifiers with logical AND or OR operations to build complex
MF-classifiers (by specifying a class type of all or any, respectively). That is, within a single
class, multiple match criteria are grouped together as an AND expression or a sequential OR
expression, depending on the defined class type. Only classes of the same type can be
nested; class nesting does not allow for the negation (i.e., exclude option) of the referenced
class.
To configure DiffServ, you must define service levels, namely the forwarding classes/PHBs
identified by a given DSCP value, on the egress interface. These service levels are defined
by configuring BA classes for each.
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